CN116711404A

CN116711404A - Terminal, base station and transmitting method

Info

Publication number: CN116711404A
Application number: CN202180089763.6A
Authority: CN
Inventors: 吉冈翔平
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2023-09-05
Also published as: WO2022153417A1

Abstract

The terminal has: a receiving unit that receives, from a base station of the 1 st operator, allocation information of resources transmitted by a side link in at least one of the 1 st operator and the 2 nd operator; a control unit that determines whether or not to transmit a side chain using the resource allocated from the base station, based on the resource allocation information; and a transmitting unit that executes the side link transmission when it is determined to perform the side link transmission.

Description

Terminal, base station and transmitting method

Technical Field

The present invention relates to a terminal and a base station in a wireless communication system.

Background

In LTE (Long Term Evolution: long term evolution) and LTE subsequent systems (for example, LTE-A (LTE Advanced) and NR (New Radio) (also referred to as 5G)), D2D technology is introduced in which terminals do not communicate directly with each other via a base station.

The D2D reduces traffic between the terminals and the base station, and enables communication between the terminals even when the base station cannot communicate at the time of a disaster or the like. In addition, in 3GPP (3 rd Generation Partnership Project: third Generation partnership project), D2D is called "sidelink", and therefore, in this specification, a sidelink is basically used as well.

The side link communication is roughly classified into discovery (discovery) for discovering other terminals capable of communication and communication for performing direct communication between terminals (also referred to as D2D direct communication, direct communication between terminals, and the like). Hereinafter, when communication (communication), discovery (discovery), and the like are not particularly distinguished, they will be simply referred to as side links. Various use cases of services related to V2X in NR (Vehicle to Everything: vehicle to all systems) are being studied.

Prior art literature

Non-patent literature

Non-patent document 1:3GPP TS 38.331V16.1.0 (2020-07)

Non-patent document 2:3GPP TS 38.214V16.2.0 (2020-06)

Non-patent document 3:3GPP TS 38.321V16.1.0 (2020-07)

Disclosure of Invention

Problems to be solved by the invention

It is conceivable that the services of the side link are provided by a plurality of different operators (which may also be referred to as communication operators) in the same area.

In the mode in which resources for side link transmission are allocated from the base station to the terminal, side link transmission that cannot be controlled from the perspective of a certain operator may occur in an environment in which a plurality of operators exist as described above. Therefore, there is a possibility that collision of side link transmission occurs between terminals of different operators.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a technique capable of avoiding collision of side link transmissions between terminals of different operators.

Means for solving the problems

According to the disclosed technology, there is provided a terminal having: a receiving unit that receives, from a base station of the 1 st operator, allocation information of resources transmitted by a side link in at least one of the 1 st operator and the 2 nd operator; a control unit that determines whether or not to transmit a side chain using the resource allocated from the base station, based on the resource allocation information; and a transmitting unit that executes the side link transmission when it is determined to perform the side link transmission.

Effects of the invention

According to the disclosed technology, a technology is provided that can avoid collisions of side link transmissions between terminals of different operators.

Drawings

Fig. 1 is a diagram for explaining V2X.

Fig. 2 is a diagram for explaining example (1) of the V2X transmission mode.

Fig. 3 is a diagram for explaining example (2) of the V2X transmission mode.

Fig. 4 is a diagram for explaining example (3) of the V2X transmission mode.

Fig. 5 is a diagram for explaining example (4) of the V2X transmission mode.

Fig. 6 is a diagram for explaining example (5) of the V2X transmission mode.

Fig. 7 is a diagram for explaining example (1) of the communication type of V2X.

Fig. 8 is a diagram for explaining example (2) of the communication type of V2X.

Fig. 9 is a diagram for explaining example (3) of the communication type of V2X.

Fig. 10 is a timing chart showing an operation example (1) of V2X.

Fig. 11 is a timing chart showing an operation example (2) of V2X.

Fig. 12 is a timing chart showing an operation example (3) of V2X.

Fig. 13 is a timing chart showing an operation example (4) of V2X.

Fig. 14 is a diagram showing an example of the monitoring operation.

Fig. 15 is a diagram showing an example of a partial monitoring operation.

Fig. 16 is a flowchart showing an example of the re-evaluation.

Fig. 17 is a diagram showing an example of re-evaluation.

Fig. 18 is a flowchart showing an example of preemption.

Fig. 19 is a diagram for explaining mode 1.

Fig. 20 is a diagram for explaining mode 1.

Fig. 21 is a diagram for explaining mode 1.

Fig. 22 is a diagram for explaining example 1.

Fig. 23 is a diagram for explaining example 1.

Fig. 24 is a diagram for explaining example 1.

Fig. 25 is a diagram for explaining example 2.

Fig. 26 is a diagram for explaining example 4.

Fig. 27 is a diagram for explaining example 4.

Fig. 28 is a diagram for explaining example 4.

Fig. 29 is a diagram for explaining example 4.

Fig. 30 is a diagram for explaining example 5.

Fig. 31 is a diagram for explaining example 5.

Fig. 32 is a diagram for explaining example 5.

Fig. 33 is a diagram for explaining example 5.

Fig. 34 is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention.

Fig. 35 is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention.

Fig. 36 is a diagram showing an example of a hardware configuration of the base station 10 or the terminal 20 according to the embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

The wireless communication system according to the embodiment of the present invention suitably uses the prior art when operating. However, this conventional technology is, for example, conventional NR (for example, the technology disclosed in non-patent documents 1 to 3) or conventional LTE, but is not limited to conventional NR or conventional LTE. Further, the term "LTE" as used in this specification has a broad meaning including LTE-Advanced and beyond (e.g., NR) or wireless LAN (Local Area Network: local area network) unless otherwise indicated.

In the embodiment of the present invention, the Duplex (Duplex) scheme may be a TDD (Time Division Duplex: time division Duplex) scheme, an FDD (Frequency Division Duplex: frequency division Duplex) scheme, or a scheme other than this (for example, flexible Duplex).

In the embodiment of the present invention, "resource" may be a time resource, a frequency resource, or a time/frequency resource.

In the embodiment of the present invention, the radio parameters such as "configuration" may be preset (Pre-configuration) predetermined values, or radio parameters notified from the base station 10 or the terminal 20 may be set.

In the following description, the operation of a higher layer (e.g., MAC layer) and a lower layer (e.g., PHY layer) in a terminal will be described as an example. The function distinction between the higher layer and the lower layer is merely an example, and the following operation may be performed without distinguishing the higher layer from the lower layer.

Fig. 1 is a diagram for explaining V2X. In 3GPP, a technology of implementing V2X (Vehicle to Everything: vehicle to everything system) or eV2X (enhanced V2X: enhanced V2X) by extending D2D functions is being studied, and standardization is being advanced. As shown in fig. 1, V2X is a part of ITS (Intelligent Transport Systems: intelligent transportation system), and is a generic term for V2V (Vehicle to Vehicle: vehicle-to-vehicle) representing a form of communication between vehicles, V2I (Vehicle to Infrastructure: vehicle-to-infrastructure) representing a form of communication between vehicles and Road Side equipment (RSU: road-Side Unit) provided beside a Road, V2N (Vehicle to Network: vehicle-to-network) representing a form of communication between vehicles and ITS servers, and V2P (Vehicle to Pedestrian: vehicle-to-pedestrian) representing a form of communication between vehicles and mobile terminals held by pedestrians.

Further, in 3GPP, V2X of cellular communication and inter-terminal communication using LTE or NR is being studied. V2X using cellular communication is also referred to as cellular V2X. In V2X of NR, research is being advanced to realize large capacity, low delay, high reliability, and QoS (Quality of Service: quality of service) control.

V2X of LTE or NR is expected to be a study not limited to 3GPP specifications in the future. For example, studies are conceivable to ensure interoperability (interoperability), reduce costs due to high-level installation, a method of combining or switching a plurality of RATs (Radio Access Technology: radio access technology), regulatory support of various countries, data acquisition, distribution, database management, and a method of use of V2X platforms of LTE or NR.

In the embodiment of the present invention, a mode in which a communication device (may also be referred to as a terminal) is mounted on a vehicle is mainly assumed, but the embodiment of the present invention is not limited to this mode. For example, the communication device may be a terminal held by a person, or may be a device mounted on an unmanned aerial vehicle or an aircraft, or may be a base station, an RSU, a Relay station (Relay Node), a terminal having scheduling capability, or the like. Herein, the vehicle on which the communication device is mounted may also be referred to as a terminal.

In addition, SL (side link) may also be distinguished according to any one or a combination of UL (Uplink) or DL (Downlink) and 1) -4) described below. Further, SL may be another name.

1) Time domain resource allocation

2) Resource allocation in the frequency domain

3) Reference synchronization signal (SLSS (Sidelink Synchronization Signal: side link synchronization signal))

4) Reference signal used in path loss measurement for transmission power control

Further, as for the OFDM of SL or UL (Orthogonal Frequency Division Multiplexing: orthogonal frequency division multiplexing scheme), any one of CP-OFDM (Cyclic-Prefix OFDM: cyclic Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM: discrete Fourier transform-Spread-OFDM), OFDM not subjected to transform precoding (Transform precoding) or OFDM subjected to transform precoding (Transform precoding) may be employed.

In the SL of LTE, mode3 (Mode 3) and Mode4 (Mode 4) are defined for resource allocation to the SL of the terminal 20. In mode3, transmission resources are dynamically allocated by DCI (Downlink Control Information: downlink control information) transmitted from the base station 10 to the terminal 20. In mode3, SPS (Semi Persistent Scheduling: semi-persistent scheduling) can also be performed. In mode4, the terminal 20 autonomously selects transmission resources from the resource pool.

In the SL of NR, mode1 (Mode 1) and Mode2 (Mode 2) are defined for resource allocation to the SL of the terminal 20. In mode1, transmission resources are allocated using DCI transmitted from the base station 10 to the terminal 20. In mode2, the terminal 20 autonomously selects transmission resources from the resource pool.

In addition, the slot (slot) in the embodiment of the present invention may be replaced by a symbol, a mini slot, a subframe, a radio frame, or a TTI (Transmission Time Interval: transmission time interval). The cell (cell) in the embodiment of the present invention may be replaced with a cell group, a carrier component, BWP, a resource pool, a resource, RAT (Radio Access Technology: radio access technology), a system (including wireless LAN), or the like.

In the embodiment of the present invention, the terminal 20 is not limited to the V2X terminal, and may be all kinds of terminals performing D2D communication. For example, the terminal 20 may be a terminal held by a user such as a smart phone, or may be an IoT (Internet of Things: internet of things) device such as a smart meter. In addition, the terminal may also be referred to as "UE".

(basic structural example and basic action example of System)

Fig. 2 to 13 described below show examples of the system configuration in the present embodiment, and also show examples of basic operations in the system of the present embodiment.

As shown in fig. 2, the wireless communication system of the present embodiment includes a terminal 20A, a terminal 20B, and a base station 10. In addition, there are actually a plurality of terminals, but fig. 2 shows the terminal 20A and the terminal 20B as examples.

Hereinafter, unless the terminals 20A, 20B, etc. are particularly distinguished, they will be simply referred to as "terminal 20" or "UE". In fig. 2, a case where both the terminal 20A and the terminal 20B are within the coverage of a cell is shown as an example, but the operation in the present embodiment can be applied to a case where the terminal 20 is out of the coverage.

In addition, the terminal 20 need not be a device of one housing, and for example, even in a case where various sensors are arranged in a vehicle in a dispersed manner, a device including the various sensors may be the terminal 20.

The processing content of the transmission data of the side link of the terminal 20 is basically the same as that of UL transmission in LTE or NR. For example, the terminal 20 may scramble a codeword of transmission data, modulate the codeword to generate complex-valued symbols (transmission signals), map the complex-valued symbols (transmission signals) to layer 1 or layer 2, and perform precoding. Then, a transmission signal (for example, complex-valued time-domain SC-FDMA signal) is generated by mapping to the resource elements, and transmitted from each antenna port.

The base station 10 has a function of cellular communication as a base station in LTE or NR and a function (for example, resource pool setting, resource allocation, and the like) for enabling the terminal 20 in the present embodiment to communicate. In addition, the base station 10 may be an RSU (gNB type RSU). The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in a time domain, which may be defined by the number of OFDM symbols, and a frequency domain, which may be defined by the number of subcarriers or the number of resource blocks. The TTI (Transmission Time Interval: transmission time interval) in the time domain may be a slot, and the TTI may be a subframe or a symbol.

In the wireless communication system according to the present embodiment, the signal waveform used by the terminal 20 in SL or UL may be OFDMA, SC-FDMA, or another signal waveform.

In the example shown in fig. 2, the terminal 20A on the transmitting side may be referred to as TX-UE, and the terminal 20B on the receiving side may be referred to as RX-UE.

Fig. 2 is a diagram for explaining an example of the operation in example (1) of the V2X transmission mode. In the transmission mode of the side link communication shown in fig. 2, in step 1, the base station 10 transmits scheduling information of the side link to the terminal 20A. Next, the terminal 20A transmits PSCCH (Physical Sidelink Control Channel: physical side link control channel) based on the received scheduling information, and transmits data (control information may be included) to the terminal 20B via PSSCH (Physical Sidelink Shared Channel: physical side link shared channel) (step 2). The control information transmitted via the PSCCH may be expressed as "transmission PSCCH", or the data transmitted via the PSSCH (control information may be expressed as "transmission PSSCH").

The transmission mode of the side-link communication shown in fig. 2 may also be referred to as a side-link transmission mode 3 in LTE. In the side link transmission mode 3 in LTE, uu-based side link scheduling is performed. Uu refers to a radio interface between UTRAN (Universal Terrestrial Radio Access Network: universal terrestrial radio access network) and UE (User Equipment). The transmission mode of the side-link communication shown in fig. 2 may be referred to as a side-link transmission mode 1 in NR.

Fig. 3 is a diagram for explaining an example of the operation in example (2) of the V2X transmission mode. In the transmission mode of the side link communication shown in fig. 3, in step 1, the terminal 20A transmits PSCCH and PSSCH to the terminal 20B using the autonomously selected resources. The transmission mode of the side-link communication shown in fig. 3 may also be referred to as a side-link transmission mode 4 in LTE. In the side link transmission mode 4 in LTE, the terminal 20A itself performs resource selection. The transmission mode of the side link communication shown in fig. 3 may also be referred to as a side link transmission mode 2 in NR. In the side link transmission mode 2 in NR, the terminal 20A itself performs resource selection.

Fig. 4 is a diagram for explaining an example of the operation in example (3) of the V2X transmission mode. In the transmission mode of the side link communication shown in fig. 4, in step 1, the terminal 20A transmits the PSCCH and the PSSCH to the terminal 20B using the autonomously selected resources. Likewise, the terminal 20B transmits the PSCCH and the PSSCH to the terminal 20A using the autonomously selected resources (step 1). The transmission mode of the side-link communication shown in fig. 4 may be referred to as a side-link transmission mode 2 or a transmission mode 2a in NR. In the side link transmission mode 2 in NR, the terminal 20 itself performs resource selection.

Fig. 5 is a diagram for explaining an example of the operation in example (4) of the V2X transmission mode. In the transmission mode of the side link communication shown in fig. 5, in step 0, the base station 10 sets the resource mode of the transmission side link to the terminal 20A via RRC (Radio Resource Control: radio resource control). Alternatively, the resource pattern of the side link is set in advance for the terminal 20A. Then, the terminal device 20A transmits the PSSCH to the terminal 20B in accordance with the received or previously set resource pattern (step 1). The transmission mode of the side link communication shown in fig. 5 may be referred to as a side link transmission mode 2c in NR.

Fig. 6 is a diagram for explaining an example of the operation in example (5) of the V2X transmission mode. In the transmission mode of the side link communication shown in fig. 6, in step 1, the terminal 20A transmits side link scheduling information to the terminal 20B via the PSCCH. Next, the terminal 20B transmits the PSSCH to the terminal 20A based on the received scheduling information (step 2). The transmission mode of the side link communication shown in fig. 6 may also be referred to as a side link transmission mode 2d in NR.

Fig. 7 is a diagram for explaining an operation example in example (1) of the V2X communication type. The type of communication for the side links shown in fig. 7 is unicast. Terminal 20A transmits the PSCCH and PSSCH to terminal 20. In the example shown in fig. 7, terminal 20A unicasts terminal 20B and unicasts terminal 20C.

Fig. 8 is a diagram for explaining an operation example in example (2) of the V2X communication type. The type of communication for the side links shown in fig. 8 is multicast. Terminal 20A transmits the PSCCH and PSSCH to the group to which one or more terminals 20 belong. In the example shown in fig. 8, the group includes a terminal 20B and a terminal 20C, and the terminal 20A multicasts the group.

Fig. 9 is a diagram for explaining an operation example in example (3) of the V2X communication type. The type of communication for the side link shown in fig. 9 is broadcast. The terminal 20A transmits the PSCCH and PSSCH to one or more terminals 20. In the example shown in fig. 9, the terminal 20A broadcasts to the terminals 20B, 20C and 20D. The terminal 20A shown in fig. 7 to 9 may be referred to as a group leader UE (head-UE).

In NR-V2X, HARQ (Hybrid automatic repeat request: hybrid automatic repeat request) is supported in unicast and multicast of the side link. In NR-V2X, SFCI (Sidelink Feedback Control Information: side link feedback control information) including HARQ acknowledgement is defined. The SFCI is sent through PSFCH (Physical Sidelink Feedback Channel).

In the following description, it is assumed that PSFCH is used for transmission of HARQ-ACK in a side link, but this is only an example. For example, the HARQ-ACK transmission in the side link may be performed using the PSCCH, and the HARQ-ACK transmission in the side link may be performed using another channel.

Hereinafter, for convenience of explanation, all information reported by the terminal 20 in HARQ will be referred to as HARQ-ACK. This HARQ-ACK may also be referred to as HARQ-ACK information. Further, more specifically, a codebook applied to information of HARQ-ACKs reported from the terminal 20 to the base station 10 or the like is referred to as a HARQ-ACK codebook (HARQ-ACK codebook). The HARQ-ACK codebook specifies a bit string of HARQ-ACK information. In addition, with "HARQ-ACK", a NACK is transmitted in addition to ACK.

Fig. 10 is a timing chart showing an operation example (1) related to V2X HARQ-ACK.

In step S101, the terminal 20A autonomously selects resources used in the PSCCH and the PSSCH from a resource selection window having a predetermined period. The resource selection window may also be set by the base station 10 for the terminal 20. In addition, in the selection of resources, a resource identification process of determining a set of candidates and a resource selection process of selecting resources from the set are performed.

In steps S102 and S103, the terminal 20A transmits SCI (Sidelink Control Information: side link control information) through PSCCH (or PSSCH) and SL data through PSSCH using the resources autonomously selected in step S101. For example, the terminal 20A may transmit the PSCCH using a frequency resource adjacent to a frequency resource of the PSSCH through the same time resource as at least a part of the time resource of the PSSCH.

Terminal 20B receives SCI (PSCCH or PSSCH) and SL data (PSSCH) transmitted from terminal 20A. Information of resources of the PSFCH for the terminal 20B to transmit the received HARQ-ACK for the data may be contained in the received SCI. The terminal 20A may include information on the autonomously selected resource (reservation information on the resource) in the SCI and transmit the information.

In step S104, the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A using the resources of the PSFCH determined by the received SCI.

If the HARQ-ACK received in step S104 is NACK (negative acknowledgement) indicating that retransmission is requested, the terminal 20A retransmits the PSCCH and the PSSCH to the terminal 20B in step S105. Terminal 20A may retransmit the PSCCH and pscsch using autonomously selected resources.

In addition, in the case where the HARQ feedback control is not performed, step S104 and step S105 may not be performed.

Fig. 11 is a timing chart showing an operation example (2) related to V2X HARQ-ACK. Blind retransmission, which does not depend on HARQ control, for improving a transmission success rate or an arrival distance can also be performed.

In step S201, the terminal 20A autonomously selects resources used in the PSCCH and the PSSCH from a resource selection window having a predetermined period. The resource selection window may also be set by the base station 10 for the terminal 20.

In steps S202 and S203, the terminal 20A transmits SCI through PSCCH (or PSSCH) and SL data through PSSCH using the resources autonomously selected in step S201. For example, the terminal 20A may transmit the PSCCH using a frequency resource adjacent to a frequency resource of the PSSCH through the same time resource as at least a part of the time resource of the PSSCH.

In step S204, the terminal 20A retransmits the SCI based on the PSCCH or PSSCH and the SL data based on the PSSCH to the terminal 20B using the resource autonomously selected in step S201. The retransmission in step S204 may also be performed a plurality of times.

In addition, in the case where blind retransmission is not performed, step S204 may not be performed.

Fig. 12 is a timing chart showing an operation example (3) related to V2X HARQ-ACK. The base station 10 may also perform scheduling of the side links. That is, the base station 10 may determine the resources of the side link used by the terminal 20 and transmit information indicating the resources to the terminal 20. In addition, when HARQ control is applied, the base station 10 may transmit information indicating the resources of the PSFCH to the terminal 20.

In step S301, the base station 10 transmits DCI (Downlink Control Information: downlink control information) to the terminal 20A via the PDCCH, thereby performing SL scheduling. For convenience of explanation, DCI for SL scheduling is referred to as SL scheduling DCI (SL scheduling DCI).

In step S301, the base station 10 may transmit DCI for DL scheduling (may also be referred to as DL assignment) to the terminal 20A through the PDCCH. For convenience of explanation, DCI for DL scheduling is referred to as DL scheduling DCI (DL scheduling DCI). The terminal 20A that receives the DL scheduling DCI receives DL data through the PDSCH using the resources specified by the DL scheduling DCI.

In steps S302 and S303, terminal 20A transmits SCI (Sidelink Control Information: side link control information) through PSCCH (or PSSCH) using the resources specified by the SL scheduling DCI, and transmits SL data through PSSCH. In addition, in the SL scheduling DCI, only the resources of the PSSCH may be specified. In this case, for example, the terminal 20A may transmit the PSCCH using a frequency resource adjacent to a frequency resource of the PSSCH through the same time resource as at least a part of the time resource of the PSSCH.

Terminal 20B receives SCI and SL data (PSSCH) transmitted from terminal 20A. SCI received with PSCCH or PSSCH contains information of resources of PSFCH for terminal 20B to transmit HARQ-ACK for reception of the data.

The information of the resource may be included in the DL scheduling DCI or the SL scheduling DCI transmitted from the base station 10 in step S301, and the terminal 20A may acquire the information of the resource from the DL scheduling DCI or the SL scheduling DCI and include the information in the SCI. Alternatively, the DCI transmitted from the base station 10 may not include information on the resource, and the terminal 20A may autonomously include the information on the resource in the SCI and transmit the information.

In step S304, the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A using the resources of the PSFCH determined by the received SCI.

In step S305, the terminal 20A transmits HARQ-ACK using PUCCH (Physical uplink control channel: physical uplink control channel) resources specified by DL scheduling DCI (or SL scheduling DCI) at a timing specified by the DL scheduling DCI (or SL scheduling DCI) (e.g., a timing in units of slots), and the base station 10 receives the HARQ-ACK.

In addition, when the HARQ feedback control is not performed, at least one of step S304 and step S305 may not be performed.

Fig. 13 is a timing chart showing an operation example (4) related to V2X HARQ-ACK. As described above, in the side link of NR, the case of transmitting the HARQ response through the PSFCH is supported. The PSFCH format can be the same as PUCCH (Physical Uplink Control Channel) format 0 (PUCCH format 0), for example. That is, regarding the format of the PSFCH, there may be a sequence-based format in which the PRB (Physical Resource Block: physical resource block) size is 1, and ACK and NACK are identified according to a difference in timing or cyclic shift (or both). The format of the PSFCH is not limited to this. The resources of the PSFCH may be configured at the end symbol or at the end multiple symbols of the slot. The period N is set for the PSFCH resource or is predetermined. The period N may be set in units of time slots or may be predetermined.

In fig. 13, the vertical axis corresponds to the frequency domain, and the horizontal axis corresponds to the time domain. The PSCCH may be arranged in one symbol at the beginning of a slot, in a plurality of symbols from the beginning, or in a plurality of symbols from symbols other than the beginning. The PSFCH may be configured for one symbol at the end of a slot or for a plurality of symbols at the end of a slot. In addition, the "slot start" may refer to a symbol whose start is X symbols among a plurality of symbols constituting one slot, or may refer to a symbol whose start is other than the start symbol of the X symbols. Similarly, "the end of a slot" may refer to the symbol at the end of an X symbol, or may refer to the last symbol among symbols other than the last symbol of an X symbol. In the example shown in fig. 13, 3 subchannels are set in the resource pool, and 2 PSFCHs are arranged after 3 slots of the slots in which the PSSCHs are arranged. The arrow from the PSSCH to the PSFCH shows an example of the PSFCH associated with the PSSCH.

Fig. 13 shows an example in which the HARQ acknowledgement in the multicast of NR-V2X is multicast option 2 for transmitting ACK or NACK. As shown in fig. 13, in step S401, the terminal 20A as the transmitting side terminal 20 performs multicast on the terminal 20B, the terminal 20C, and the terminal 20D as the receiving side terminal 20 via the SL-SCH. In the next step S402, the terminal 20B transmits the HARQ response to the terminal 20A using the psfch#b, the terminal 20C transmits the HARQ response to the terminal 20A using the psfch#c, and the terminal 20D transmits the HARQ response to the terminal 20A using the psfch#d. In multicast option 1, only NACK is transmitted and no ACK is transmitted as an HARQ response.

Fig. 14 is a diagram showing an example of a monitoring operation as a basic operation example of the system in the present embodiment. Here, as an example, an example of a monitoring operation in LTE is shown. In the case where the LTE-side link is not monitored by a higher layer setting section (partial transmission), the terminal 20 selects a resource to transmit as shown in fig. 14. As shown in fig. 14, the terminal 20 performs monitoring in a monitoring window within the resource pool. By monitoring, the terminal 20 receives the resource reservation field contained in the SCI transmitted from the other terminal 20, and identifies resource candidates that can be used in the resource selection window in the resource pool based on the field. Next, the terminal 20 randomly selects a resource from available resource candidates. The monitoring of all resources within a monitoring window may be referred to as full monitoring (full sensing).

Further, as shown in fig. 14, the setting of the resource pool may have a period. For example, the period may be a period of 10240 milliseconds. Fig. 14 is a subframe t ₀ ^SL To subframe t _Tmax ^SL Is set as an example of a resource pool. The area of the resource pool within the period may be determined, for example, byA bitmap.

Further, as shown in fig. 14, it is assumed that a transmission trigger in the terminal 20 occurs in the subframe n, the priority of the transmission being p _TX . The terminal 20 can detect that the subframe t is in _n-10×Pstep ^SL To subframe t _n-1 ^SL For example, other terminals 20 are proceeding with priority p in the monitoring window of (a) _RX Is transmitted by the base station. When the SCI is detected in the monitoring window and the RSRP is larger than the threshold, the resources in the resource selection window corresponding to the SCI are excluded. In addition, when SCI is detected in the monitoring window and RSRP is smaller than the threshold value, resources in the resource selection window corresponding to the SCI are not excluded. The threshold value may be based on the priority p _TX And priority p _RX To set or define a threshold Th per resource within the monitoring window _pTX,pRX 。

Further, a subframe t as shown in fig. 14 _Z ^SL In that way, for example, for transmission, resources in the resource selection window corresponding to resources in the monitoring window that are not monitored are excluded.

As shown in fig. 14, in subframe n+t ₁ To subframe n+T ₂ And (3) identifying resources occupied by other UEs, wherein the resources after the resources are excluded become a set of available resource candidates. Let the set of available resource candidates be S _A At the time of S _A When the number of resources is smaller than 20% of the resources in the resource selection window, the threshold Th set for each resource in the monitoring window is set _pTX,pRX The 3dB rise is performed again to identify the resource.

That is, by making the threshold Th _pTX,pRX The identification of resources is performed again by rising to increase resources that were not excluded because RSRP is less than the threshold. And measure S _A And appends the resource with the smallest RSSI to the set S _B . Repeating the steps S _A The resource with the minimum RSSI contained in the S is added to the S _B Up to a set S of resource candidates _B Becomes more than 20% of the resource selection window.

The lower layers of the terminal 20 will S _B Reporting to higher layers.High-level pair S of terminal 20 _B A random selection is performed to determine the resources to be used. The terminal 20 performs side link transmission using the decided resources. In addition, the terminal 20 may temporarily secure the resource not a predetermined number of times (e.g., C _resel Secondary) to monitor and periodically use the resource.

Fig. 15 is a diagram showing an example of a partial monitoring operation. When the LTE-side link is partially monitored by the higher layer, the terminal 20 selects resources to transmit as shown in fig. 15. As shown in fig. 15, the terminal 20 performs partial monitoring on a portion of the monitoring window within the resource pool. By the partial monitoring, the terminal 20 receives a resource reservation field contained in SCI transmitted from other terminals 20, and identifies resource candidates that can be used in a resource selection window in the resource pool based on the field. Next, the terminal 20 randomly selects a resource from available resource candidates.

Further, as shown in fig. 15, the setting of the resource pool may have a period. For example, the period may be a period of 10240 milliseconds. Fig. 15 is a subframe t ₀ ^SL To subframe t _Tmax ^SL Is set as an example of a resource pool. The area of the resource pool within the period may be set by a bitmap, for example.

As shown in fig. 15, it is assumed that a transmission trigger in the terminal 20 occurs in the subframe n, and the priority of the transmission is p _TX . In the example of fig. 15, subframe n+t ₁ To subframe n+T ₂ In subframe t _y ^SL To subframe t _y+Y ^SL Is set as the resource selection window. Further, as shown in fig. 15, it is assumed that a transmission trigger in the terminal 20 occurs in the subframe n, and the priority of the transmission is p _TX 。

The terminal 20 can detect the presence of the subframe t which is the Y subframe length _y-k×Pstep ^SL To subframe t _y+Y-k×Pstep ^SL For example, other terminals 20 are in progress with priority p _RX Is transmitted by the base station. k may be, for example, a 10-bit bitmap. In fig. 15, an example is shown in which the 3 rd and 6 th bits of the bitmap k are set to "1" indicating partial monitoring.That is, in fig. 15, subframe t _y-6×Pstep ^SL To subframe t _y+Y-6×Pstep ^SL And subframe t _y-3×Pstep ^SL To subframe t _y+Y-3×Pstep ^SL Is set as the monitoring window. As described above, the ith bit of bitmap k corresponds to subframe t _y-i×Pstep ^SL To subframe t _y+Y-i×Pstep ^SL Is provided.

If SCI is detected in the one or more monitoring windows and RSRP is greater than the threshold, resources in the resource selection window corresponding to the SCI are excluded. In addition, when SCI is detected in the monitoring window and RSRP is smaller than the threshold value, resources in the resource selection window corresponding to the SCI are not excluded. The threshold value may be based on the priority p _TX And priority p _RX Threshold Th set or defined per resource within the monitoring window _pTX,pRX 。

In the resource selection window in which the Y subframes are set, the terminal 20 recognizes resources occupied by other UEs, and the resources from which the resources are excluded become available resource candidates. Let the set of available resource candidates be S _A At the time of S _A When the number of resources is smaller than 20% of the resources in the resource selection window, the threshold Th set for each resource in the monitoring window is set _pTX,pRX The 3dB rise is performed again to identify the resource. That is, by making the threshold Th _pTX,pRX The identification of resources is performed again by rising to increase resources that were not excluded because RSRP is less than the threshold. And measure S _A Adding the resource with the minimum RSSI to the set S _B . Repeating the steps S _A The resource with the minimum RSSI contained in the S is added to the S _B Up to a set S of resource candidates _B Becomes more than 20% of the resource selection window.

The lower layers of the terminal 20 will S _B Reporting to higher layers. The higher layers of terminal 20 may respond to S _B A random selection is performed to determine the resources to be used. The terminal 20 may perform side chain transmission using the decided resources. The terminal 20 may temporarily secure the resource, and then may not secure the resource a predetermined number of times (for exampleSuch as C _resel Secondary) to monitor and periodically use the resource.

In fig. 14 and 15 described above, the operation of the transmitting side terminal 20 is described, but the receiving side terminal 20 detects data transmission from another terminal 20 based on the result of monitoring or partial monitoring, and receives data from the other terminal 20.

The selection operation of resources in NR (for example, non-patent documents 2 and 3) is basically the same as the selection operation of resources in LTE.

That is, the TX-UE selects all resources (set to M _total . Initially M _total ＝S _A ) In (3), a specific resource detected according to the monitoring in the monitoring window is selected from S _A Excluding from the middle. Specific resources refer to resources reserved for SCI received by TX-UE and having RSRP (received power) above a threshold, unmonitored resources, etc. with respect to the SCI.

After the amount of the identified resource (S _A The amount of resources) is less than X% of the total amount of resources in the resource selection window of the resource pool, the threshold is increased by 3dB and the above-described process is repeated until the amount of resources becomes X% or more. X is, for example, 20. In addition, one resource is, for example, a resource of "one slot× (one or more subchannels)". The RSRP may be a value measured by DM-RS of a resource of the PSCCH that transmits the SCI, or a value measured by DM-RS of a resource of the PSCCH that is indicated (reserved) by the SCI.

In TX-UE, the determined S _A Reported to higher layers where, for example, the code is randomly selected from S _A Selecting a transmission resource. In NR, power saving based on the above partial monitoring can be performed.

On the other hand, in the side link of the NR version 16, a preemption (pre-transmission) confirmation and re-evaluation (re-evaluation) function is employed, and the terminal 20 in the present embodiment can perform preemption confirmation and re-evaluation. The preemption confirm and reevaluation is a function for selecting the resource allocation pattern 2 of the resource autonomously transmitted by the terminal 20, but may be used in the pattern 1 in the present embodiment.

Fig. 16 is a flowchart for explaining an example of the reevaluation. Fig. 17 is a diagram showing an example of re-evaluation. In step S501, the terminal 20 performs monitoring in a monitoring window. In the case where the terminal 20 performs the power saving operation, the monitoring may be performed for a predetermined limit period. Then, the terminal 20 identifies each resource in the resource selection window based on the monitoring result, and decides a set of resource candidates S _A (S502). Then, the terminal 20 selects from the set of resource candidates S _A Resource sets (r_0, r_1, … …) are selected (S503). The resource set may also be a predetermined resource selected in a higher layer for transmission.

In step S504, the terminal 20 performs, for example, T (r_0) -T shown in fig. 17 ₃ Based on the monitoring result, re-identifying each resource in the resource selection window, and determining the set S of resource candidates _A . Next, at S _A If the resource r_i is not included, the terminal 20 excludes r_i from the resource set (S505), updates the resource set, and ends the re-evaluation. In the higher layer, resources are selected from the re-evaluated set of resources.

In the example of re-evaluation shown in fig. 17, r_1 of the resources r_0 and r_1 is not included in S due to the re-monitoring result _A Thus, is excluded from the resource set. Therefore, the terminal 20 performs transmission using the resource r_0.

Fig. 18 is a timing chart showing an example of preemption confirmation. In fig. 17, the operation will be described by replacing "re-evaluation" with "preemptive acknowledge" and replacing "r_0" and "r_1" with "r '_0" and "r' _1". In step S601, the terminal 20 performs monitoring in a monitoring window. In the case where the terminal 20 performs the power saving operation, the monitoring may be performed for a predetermined limit period. Then, the terminal 20 identifies each resource in the resource selection window based on the monitoring result, and decides a set of resource candidates S _A (S602). Then, the terminal 20 selects from the set of resource candidates S _A Resource sets (r '_0, r' _1, … …) are selected (S603). The resource set may also be a predetermined resource selected in a higher layer for transmission.

In step S604, the terminal 20 performs a process of T (r_0) -T shown in fig. 17 ₃ Based on the monitoring result, re-identifying each resource in the resource selection window based on the priority, and determining the set S of resource candidates _A . For example, r' _1 shown in fig. 17 is included in the set S by monitoring again _A Is a kind of medium.

In the case where the preemption acknowledgement is valid, when the value prio_rx indicating the priority of SCI transmitted from the other terminal 20 is lower than the value prio_tx indicating the priority of transport block transmitted from the own terminal, the terminal 20 transmits a request to the other terminal _A Excluding resource r' _1. In addition, if the value indicating the priority is a lower value, the priority becomes higher. That is, when the value prio_rx indicating the priority of SCI transmitted from the other terminal 20 is higher than the value prio_tx indicating the priority of transport block transmitted from the own terminal, the terminal 20 does not transmit the data from S _A Excluding resource r' _1.

Hereinafter, the priority level is assumed to be high in this case, meaning that the priority level is high.

In step S605, at S _A If the resource r '_i is not included, the terminal 20 excludes r' _i from the resource set (S605), and updates the resource set S _A . In this case, it is determined that r' _i cannot be used based on the higher layer parameters and prio_tx and prio_rx, and preemption confirmation is ended. The terminal 20 updates S _A Selecting a transmission resource.

(mode 1)

The technique described in this embodiment is not limited to a specific radio system such as NR and LTE and a specific mode, but, for example, a mode 1 of NR (resource allocation mode 1) is assumed, and therefore, an outline of mode 1 is described here.

As described with reference to fig. 2 and the like, in mode 1, transmission resources of SL are allocated from the base station 10 to the terminal 20. That is, as shown in fig. 19, the terminal 20 allocates a transmission resource (i.e., pscch. Pscch) for SL to the terminal 20 by a PDCCH (specifically, DCI) received from the base station 10, and the terminal 20 performs SL transmission using the resource.

More specifically, in the allocation of SL transmission from the base station 10 to the terminal 20, there are dynamic grant (DG: dynamic grant), configuration grant (CG: configurewd grant) type 1 and CG type 2. In mode 1, DCI format 3_0 is used for DG and CG type 2. The monitoring timing of DCI format 3_0 is set separately from other formats.

Fig. 20 shows an example of fields of the DCI format 3_0. As shown in fig. 20, the information notified by the DCI format 3_0 includes information on scheduled resources, information on initial/retransmission, and information on feedback. Regarding the information related to the initial/retransmission, the terminal 20A on the transmitting side manages the relationship between the HPN (HARQ Process Number: HARQ process number) specified by the DCI format 3_0 and the HPN in the SCI.

The feedback is as described with reference to fig. 12 and the like. In fig. 21, resources in the case illustrated in fig. 12 are shown. As shown in fig. 21, HARQ-ACK fed back to the terminal 20A through PSFCH can be fed back to the base station 10 through PUCCH.

(subject)

It is conceivable that the service of SL is provided by a plurality of different communication carriers in the same territory. Hereinafter, the communication carrier is referred to as an "operator".

That is, a situation where a plurality of terminals 20 belonging to different operators exist at a distance from each other where a signal arrives is conceivable. In such an environment, when SL communication is performed by a plurality of terminals 20, SL transmission which cannot be controlled from the perspective of an operator occurs. For example, a SL signal transmitted by the terminal 20A belonging to the operator a using the resource scheduled from the base station 10A may cause interference to the terminal 20B of the operator B performing signal reception.

Examples 1 to 5 will be described below as specific technical examples for solving the above problems. Examples 1 to 5 can be implemented in any combination. In embodiments 1 to 5, it is assumed that synchronization is achieved in a communication system between a plurality of operators.

Example 1

< basic action >

First, example 1 is explained. In embodiment 1, the terminal 20 that has scheduled SL transmission determines whether or not to perform scheduled SL transmission or a transmittable resource based on a signal received from another terminal 20.

That is, the terminal 20 of a certain operator, which has scheduled SL transmission, avoids collision with signals belonging to other operators from information acquired by using SL signals received from terminals 20 belonging to other operators. Basically, in embodiment 1, the terminal 20 of a certain operator, which has scheduled SL transmission, monitors SL signals transmitted from terminals 20 belonging to other operators to perform collision avoidance, similarly to the monitoring in the above-described mode 2.

A specific example will be described with reference to fig. 22. As shown in fig. 22, it is assumed that there is a base station 10-1 of the operator 1, a terminal 20-1 of the operator 1, a base station 10-2 of the operator 2, and a terminal 20-2 of the operator 2.

The terminal 20-1 is scheduled for SL transmission by the schedule #1 from the base station 10-1, and the terminal 20-2 is scheduled for SL transmission by the schedule #2 from the base station 10-2.

Terminal 20-2 transmits a SL signal based on schedule #2, and terminal 20-1 receives the SL signal. The terminal 20-1 determines whether or not the resource allocated by the schedule #1 can be used based on the SL signal received from the terminal 20-2.

For example, terminal 20-1 receives SCI from terminal 20-2 as the SL signal, and determines that resources indicated by a in fig. 23 are reserved based on the SCI. On the other hand, by schedule #1, the resource denoted by B is allocated to terminal 20-1 as the SL transmission resource.

When detecting that the reserved resource of the terminal 20-2 collides with the resource B allocated to itself, the terminal 20-1 determines that the resource B is not available, and does not perform SL signaling using the resource B, for example. Thus, interference with one or more terminals 20 of the operator 2 can be avoided.

In the above example, the terminal 20-1 determines whether or not the resource allocated to itself can be used based on the information of the resource reservation received from the terminal 20-2, but this is merely an example. The terminal 20-1 may determine whether or not to use the resource allocated to itself based on either or both of the information indicated by the time resource allocation field (time resource assignment field) and the information indicated by the resource reservation period field (resource reservation period field) in the SCI received from the terminal 20-2.

The terminal 20-1 may determine whether or not to use the resource allocated from the base station 10-1 based on the received power of the SL signal received from the terminal 20-2. For example, when the received power of the SL signal of a certain resource received from the terminal 20-2 is equal to or higher than the threshold value and a part or all of the resource overlaps with a part or all of the resource allocated from the base station 10-1, the terminal 20-1 may determine that the resource is not available.

When determining whether or not the resources allocated from the base station 10-1 can be used, the terminal 20-1 may perform the same operation as the re-evaluation or Pre-preemption described above by considering the resources allocated from the base station 10-1 as the resources selected in the mode 2 itself.

< action of selecting resources >

In the above example, the terminal 20-1 determines whether or not the resource allocated from the base station 10-1 can be used based on the SL signal received from the other terminal 20, but the resource selection operation described below may be performed as a more detailed operation.

In the use resource selection operation, a plurality of resources are allocated from the base station 10-1 to the terminal 20-1 as available resources for SL transmission. Terminal 20-1 selects a resource to be used from among a plurality of resources based on the SL signal received from terminal 20-2, and performs SL transmission using the selected resource.

For example, it is assumed that four resources A, B, C, D are allocated from the base station 10-1 to the terminal 20-1 as resources available for SL transmission. The terminal 20-1 performs SL transmission using either one or both of the resources C and D when it determines from the SL signal received from the terminal 20-2 that the terminal 20-2 is using (including reserving) the resource A, B.

The plurality of resources allocated from the base station 10-1 may be allocated by a plurality of DCIs or may be allocated at a time by one DCI. The plurality of resources allocated at a time may be four or more resources.

Further, a plurality of resources may be set (one set), and a set among sets may be indicated from the base station 10-1 to the terminal 20-1.

For example, when a set 1 having four resources A, B, C, D is designated from the base station 10-1 to the terminal 20-1 as a set of available resources, the terminal 20-1 selects a resource to be utilized from the resources A, B, C, D included in the set 1.

In the resource selection operation for allocating a plurality of resources from the base station 10-1 to the terminal 20-1, the terminal 20-1 may perform feedback (feedback) to the base station 10-1 as described with reference to fig. 12. In this case, the terminal 20-1 may determine a resource for feedback (for example, a time resource, a frequency resource, or a time/frequency resource) based on a specific (for example, "last in time" or "first in time") resource among the plurality of resources. The resources for feedback may not be based on the resources actually used for SL transmission.

For example, it is assumed that the terminal 20-1 receives the allocation of the resource A, B, C, D as a plurality of resources and performs SL transmission using the resource a. Further, when it is assumed that the temporally last resource among the resources A, B, C, D is the resource D, for example, the terminal 20-1 transmits feedback on SL transmission using the resource a to the base station 10-1 by a predetermined number of slots after the slot of the resource D.

< reporting action to base station >

For example, the terminal 20-1 may transmit NACK to the base station 10-1 when SL transmission using the resources allocated from the base station 10-1 is not performed based on signal reception from the terminal 20-2.

In the above-described operation of selecting the use resource, the terminal 20-1 may report to the base station 10-1 a resource which is not used for SL transmission among the plurality of resources allocated from the base station 10-1.

< about resource group >

In embodiment 1, a resource group (e.g., a transmission resource pool) usable for SL transmission may be shared among operators. The resource group that can be used for SL transmission may be the same as the resource group (e.g., reception resource pool) that should receive the SL signal (i.e., that should monitor the SL signal).

Fig. 24 shows an example. In the example shown in fig. 24, the transmission resource pool and the reception resource pool are the same, and the transmission resource pool and the reception resource pool of the operator 1 and the operator 2 are the same.

< Effect of example 1 >

It is conceivable that the terminal 20 performing the operation of mode 1 also supports the operation of mode 2. In embodiment 1, the terminal 20 performs the same operation as the monitoring in the mode 2 and re-evaluation or Pre-preemption confirmation to avoid signal collision with the terminals 20 of other operators, and therefore, there is an effect that additional terminal installation can be suppressed and collision between terminals operating in the mode 1 can be avoided.

Example 2

Example 2 is premised on example 1 described above. In embodiment 2, a part of the resource group (for example, reception resource pool) that should receive the SL signal (that is, should monitor the SL signal) may be a resource group (for example, transmission resource pool) that can be used for transmission of the SL signal.

Fig. 25 shows an example of a transmission resource pool (TX resource pool) and a reception resource pool (RX resource pool). The example shown in fig. 25 assumes that there are conditions of the base station 10-1 and the terminal 20-1 belonging to the operator 1, and the base station 10-2 and the terminal 20-2 belonging to the operator 2 as shown in fig. 22.

As shown in fig. 25, in this example, the reception resource pool is shared between the operators 1 and 2. On the other hand, a part of the reception resource pool (in the example of fig. 25, the upper half) is the transmission resource pool of the operator 1, and the other part of the reception resource pool (in the example of fig. 25, the lower half) is the transmission resource pool of the operator 2. That is, the transmission resource pool is divided among operators.

The resource pool setting described above may be determined in advance in the specification, and the terminal 20 and the base station 10 of each operator may operate according to the specification, or the terminal 20 may be set from the base station 10 in each operator by an RRC signal, MAC CE, DCI, or the like.

As shown in fig. 25, the resource pool setting for dividing the transmission resource pool among operators can be performed to avoid a collision between the allocation resources to the terminal 20-1 and the allocation resources to the terminal 20-2.

< Effect of example 2 >

As described above, in embodiment 2, the collision of SL transmissions between the terminal 20 belonging to a certain operator and the terminal 20 belonging to another operator can be avoided by the setting in advance. This makes it possible to prevent collision of SL transmissions between terminals under control of different operators.

Example 3

Next, example 3 is described. Example 3 is premised on examples 1 and 2. However, example 3 may be based on example 1 alone. Alternatively, other embodiments may be combined.

In embodiment 3, SCI transmitted by terminal 20 may include information indicating the operator to which base station 10 having performed the corresponding scheduling belongs. The information representing the operator may also be the PLMN (Public Land Mobile Network: visited public land mobile network) number of the operator.

For example, the base station 10 may associate a field value (field value) of the PLMN with the SCI in a higher layer with the terminal 20, and instruct the PLMN to instruct one of the field values when the terminal 20 transmits the SCI.

For example, the terminal 20 of one operator may perform the collision avoidance operation described in embodiment 1 only when receiving SL signals of other operators (i.e., SL signals including information identifying other operators).

Example 4

Next, example 4 is described. Example 4 may be carried out not on the premise of examples 1 to 3, but in combination with any one or any plurality of or all of examples 1 to 3.

In embodiment 4, the terminal 20 receives the information a related to SL from the base station 10, and transmits information B based on the information a to the other terminal 20. The other terminal 20 may transmit information C based on the information B to the base station 10 of the operator to which the terminal itself belongs.

As described above, fig. 26 shows an example of the information flow in the case of using the information A, B, C. In the example of fig. 26, there are a base station 10-1 and a terminal 20-1 belonging to an operator 1 and a base station 10-2 and a terminal 20-2 belonging to an operator 2. The terminal 20-1 receives the information a from the base station 10-2 and transmits information B based on the information a to the terminal 20-2. The terminal 20-2 transmits information C based on the information B to the base station 10-2.

It is to be noted that it is not necessary for the terminal 20-1 to transmit information B based on the information a received from the base station 10-1 to the terminal 20-2 and for the terminal 20-2 to transmit information C based on the information B to the base station 10-2, either or both of them may not be executed.

In embodiment 4, by the above-described operation, the terminal 20 belonging to a certain operator avoids collision with SL transmissions between terminals 20 belonging to other operators based on information from the base station 10 of the operator or information from other terminals 20.

In the following, the case shown in fig. 26 will be taken as an example, and examples of the operation related to the transmission and the content of the information will be described with respect to the information a, the information B, and the information C, respectively.

< information A >

In fig. 26, a signal including information a transmitted from the base station 10-1 to the terminal 20-1 may be UE-specific DCI, group-common DCI, or higher layer signaling (e.g., MAC CE, RRC signal).

The information a transmitted from the base station 10-1 to the terminal 20-1 may be information about the resource transmitted by SL, which the base station 10-1 has scheduled one or more terminals under its own control (for example, all terminals under control). That is, for example, when the terminal 1, the terminal 2, and the terminal 3 are present under the control of the base station 10-1, the information a may include resource information of SL transmission scheduled for the terminal 1, resource information of SL transmission scheduled for the terminal 2, and resource information of SL transmission scheduled for the terminal 3.

The information a may be information about a resource transmitted by SL, which is scheduled by a base station (in the example of fig. 26, the base station 10-2) of an operator other than the operator 1 to which the base station 10-1 transmitting the information a belongs, for one or more terminals under control of the base station (for example, all terminals under control).

In any of the above cases, the information a transmitted from the base station 10-1 to the terminal 20-1 may include scheduling information for SL transmission to the terminal 20-1.

The terminal 20-1 may perform a predetermined operation when some or all of the resources allocated from the base station 10-1 for SL transmission overlap with some or all of the resources indicated by the information a (e.g., SL transmission resources in other operators).

The predetermined operation of the terminal 20-1 is, for example, to stop SL transmission using the resource allocated to itself. In this case, the terminal 20-1 may also transmit a NACK to the base station 10-1.

The predetermined operation of the terminal 20-1 may be to increase the transmission power and perform SL transmission using the resources allocated to itself. The predetermined operation of the terminal 20-1 may be to perform SL transmission using the resources allocated to itself as usual.

The above-described operations (transmission stop, transmission power increase, and normal transmission) may be determined based on at least one of priority (priority) of the allocated resources, the allocation order of the resources, and whether or not reservation of the resources is possible. As an example, if the type of priority of the allocated resource is high or low, the transmission power is increased if the priority=high, normal transmission is performed if the priority=low, and transmission is stopped if the priority=low.

< information B >

The terminal 20-1 may be configured to transmit the information B without fail after receiving the information a, or may be configured to determine whether or not a predetermined condition is satisfied, and transmit the information B only when it is determined that the predetermined condition is satisfied. The predetermined condition is, for example, that transmission is expected at a predetermined time (e.g., a time slot or a time window).

As an example, when the terminal 20-1 predicts that the SL transmission is performed from the time when the information a is received (for example, time slot k) to the time after n time slots (i.e., time slot k+n), the terminal transmits the information B at the timing of the SL transmission, for example. The "scheduled SL transmission" is, for example, scheduled for SL transmission by the terminal 20-1 or SL transmission by a resource autonomously selected by the terminal 20-1.

The terminal 20-1 may transmit the information B through a dedicated resource for transmitting the information B, or may transmit the information B through a resource preset as an independent resource between operators. As an example, it is assumed that the resource B1 is set for the terminal 20-1 for the transmission of the information B in the carrier 1, and the resource B2 is set for the terminal 20-2 for the transmission of the information B in the carrier 2. At this time, the terminal 20-1 transmits the information B using the resource B1.

The terminal 20-1 may unconditionally transmit the information B after being allocated with the resource for transmitting the information B. Further, a predetermined (for example, highest) priority is assigned to the resource for transmitting the information B, and the terminal 20-1 can transmit the information B based on the priority.

The signal including the information B transmitted by the terminal 20-1 may be transmitted through a data channel, a control channel, a feedback channel, or a dedicated channel other than the above.

The signal containing the information B transmitted by the terminal 20-1 may be SCI. In the case of using SCI, the format of SCI may be any format. In addition, an SCI specific format including information B may be used as the format of SCI.

In addition, the signal containing the information B transmitted by the terminal 20-1 may be transmitted through higher layer signaling (e.g., MAC CE, RRC signal). In addition, the signal including the information B transmitted by the terminal 20-1 may be transmitted by any one of broadcast (broadcast)/multicast (groupcast)/unicast (unicast).

The information B transmitted by the terminal 20-1 may be, for example, information of resources that the terminal 20 cannot use for SL transmission, except for the operator 1 to which the terminal 20-1 belongs. The information of the resource which cannot be used for SL transmission may be information of a predetermined resource which is used by the terminal 20 other than the terminal 20 for the terminal 20 which receives the information B.

For example, when information of a resource for SL transmission, which is scheduled for 1 or more terminals 20 under control of the operator 1, is transmitted from the base station 10-1 to the terminal 20-1 as information a, the terminal 20-1 may transmit information a as information B (i.e., information of a resource which cannot be used for SL transmission by the terminals 20 of other operators).

The terminal 20-2 receiving the information B may perform a predetermined operation when a part or all of the resources allocated to itself from the base station 10-2 for SL transmission overlap with a part or all of the resources indicated by the information B (for example, SL transmission resources in other operators).

The predetermined operation of the terminal 20-2 is, for example, to stop SL transmission using the resource allocated to itself. In this case, the terminal 20-2 may also transmit a NACK to the base station 10-2.

The predetermined operation of the terminal 20-2 may be to increase the transmission power and perform SL transmission using the resources allocated to itself. The predetermined operation of the terminal 20-2 may be to perform SL transmission using the resources allocated to itself as usual.

The above-described operations (transmission stop, transmission power increase, and normal transmission) may be performed according to at least one of priority (priority) of the allocated resources, the allocation order of the resources, and whether or not reservation of the resources is possible. As an example, if the type of priority of the allocated resource is high or low, the transmission power is increased if the priority=high, normal transmission is performed if the priority=low, and transmission is stopped if the priority=low. The above may be performed according to at least one of priority, allocation order, and whether or not reservation of the resource is possible.

< information C >

In fig. 26, the terminal 20-2 may transmit the information C to the base station 10-2 each time after receiving the information B, or may transmit the information C to the base station 10-2 only when a predetermined condition is satisfied. The predetermined condition may be "information B received".

The predetermined condition may be, for example, that UL transmission is expected in a predetermined time (for example, a time slot or a time window).

As an example, when the terminal 20-2 expects to perform UL transmission from the time when the information B is received (for example, time slot k) to the time after n time slots (i.e., time slot k+n), the terminal transmits the information C at the timing of the UL transmission, for example. The "scheduled UL transmission" may be, for example, UL transmission to the terminal 20-2 scheduled UL transmission or UL transmission to a resource autonomously selected by the terminal 20-2.

The terminal 20-2 may also transmit the information C through periodic resources. Further, aperiodic resources through which the terminal 20-2 transmits the information C can be scheduled from the base station 10-2 to the terminal 20-2.

The signal containing the information C transmitted by the terminal 20-2 may be transmitted through a data channel, a control channel, a feedback channel, or a dedicated channel.

In addition, the signal containing the information C transmitted by the terminal 20-2 may be UCI. In case of using UCI, the format of UCI may be any format. In addition, a UCI-specific format including information C may also be used as the format of UCI.

In addition, the signal containing the information C transmitted by the terminal 20-2 may be transmitted through higher layer signaling (e.g., MAC CE, RRC signal).

Hereinafter, as a specific operation example concerning the above-described information A, B, C, examples 4-1 to 4-3 will be described with reference to the drawings.

< example 4-1>

FIG. 27 is a view for explaining example 4-1. In S11, the terminal 20-1 of the operator 1 receives, from the base station 10-1, information of resources for SL transmission allocated to one or more terminals 20 in the operator 2 as information a.

In S12, the terminal 20-1 receives information on the resource for SL transmission to itself. In S13, the terminal 20-1 compares the information of the resources allocated by the operator 2 shown in the information a received in S11 with the information of the resources addressed to itself received in S12, and thereby performs transmission control such as judgment as to whether or not SL transmission using the allocated resources in S12 can be performed. Specifically, as described above, for example, transmission is stopped, transmission with increased transmission power, or normal transmission is performed.

< example 4-2>

FIG. 28 is a view for explaining example 4-2. In S22, the terminal 20-1 of the operator 1 receives, from the base station 10-1, information of resources for SL transmission allocated to one or more terminals 20 in the operator 1 as information a.

In S22, the terminal 20-1 transmits the information received as the information a as the information B to the terminal 20-2.

In S23, the terminal 20-2 receives information on the resource for SL transmission to itself. In S24, the terminal 20-2 compares the information of the resources allocated by the operator 1 shown in the information B received in S22 with the information of the resources addressed to itself received in S23, and thereby executes transmission control such as judgment as to whether or not SL transmission using the allocated resources in S23 can be performed. . Specifically, as described above, for example, transmission is stopped, transmission with increased transmission power, or normal transmission is performed.

< examples 4 to 3>

FIG. 29 is a view for explaining example 4-3. In S31, the terminal 20-1 of the operator 1 receives, from the base station 10-1, information of resources for SL transmission allocated to one or more terminals 20 in the operator 1 as information a.

In S32, the terminal 20-1 transmits information received as information a as information B to the terminal 20-2. In S33, the terminal 20-2 transmits information received as information B as information C to the base station 10-2.

In embodiment 4-3, as a terminal of the operator 2, a terminal 21-2 is shown in addition to the terminal 20-2. In S34, the terminal 21-2 receives, from the base station 10-2, information of resources for SL transmission allocated to one or more terminals 20 in the operator 1 as information a.

In S35, the terminal 21-2 receives information on the resource for SL transmission to itself. In S36, the terminal 21-2 compares the information of the resources allocated by the operator 1 shown in the information a received in S34 with the information of the resources addressed to itself received in S35, and thereby performs transmission control such as judgment as to whether or not SL transmission using the allocated resources in S35 is possible. . Specifically, as described above, for example, transmission is stopped, transmission with increased transmission power, or normal transmission is performed.

Furthermore, in the above example, the base station 10-2 may implement scheduling in S35 according to the information C to avoid collision with the resources of the operator 1. That is, the base station 10-2 may determine the resource for SL transmission by the terminal 21-2 based on the information C, and transmit the allocation information of the resource to the terminal 21-2 so as to avoid collision with the resource of the operator 1.

< Effect of example 4 >

In embodiment 4, for example, the base station 10 of each operator can know the SL allocation status of the other operators. The method for the base station 10 to know the SL allocation status of other operators may be known from the report from the terminal 20 or may be known by transmitting and receiving information between the base stations.

Thus, the base station 10 can schedule the terminal 20 under control of itself so that transmission collision does not occur between terminals 20 of other operators. Further, according to embodiment 4, the terminal 20 can learn the SL allocation status in other operators, and can accordingly perform the transmission collision avoidance operation.

Example 5

Next, example 5 is described. Example 5 may be carried out not on the premise of examples 1 to 4, but may be carried out in combination with any one or any plurality or all of examples 1 to 4.

In embodiment 5, a terminal 20 performing SL transmission is connected to base stations 10 of a plurality of operators. That is, the terminal 20 performing SL transmission is connected not only to the base station 10 of the operator to which the terminal itself belongs but also to the base stations 10 of other operators. Thus, the terminal 20 of one operator can avoid collision with SL transmission between terminals 20 of other operators based on information acquired by using signals from the respective operators.

In embodiment 5, "the terminal 20 is connected to the base station 10" includes "the terminal 20 receives a signal from the base station 10 without establishing a connection such as RRC, in addition to establishing a connection through RRC or the like. In embodiment 5, a resource group (for example, a resource pool, CC, or serving cell) that can be used by only the terminal 20 connected to the base stations 10 of a plurality of operators may be set for the terminal 20.

Hereinafter, more specific examples will be described based on the viewpoints of connection methods and scheduling methods with base stations of a plurality of operators, scheduling information reception methods from a plurality of base stations, and transmission control.

< method example of connection to base stations of multiple operators and Transmission control >

Here, as in the case shown in fig. 22, 26, and the like, it is assumed that there are a case where, from the point of view of the terminal 20-1, the operator 1 capable of transmitting its own scheduling information and a case where only the operator 2 transmits resource allocation information for the terminal 20-2 as the other terminal 20. More specifically, the base station 10-1 transmits scheduling information of the operator 1, and the base station 10-2 transmits scheduling information of the operator 2.

An example of a connection method in this case is described with reference to fig. 30. In S41, an RRC connection is established between the terminal 20-1 and the base station 10-1. On the other hand, no RRC connection establishment is performed between the terminal 20-1 and the base station 10-2, and in S42, the terminal 20-1 receives the SSB and the system information transmitted from the base station 10-2. The SSB or the system information may include information of resources for receiving information (for example, DCI) transmitted from the base station 10-2 in S44 described later.

In S43, the terminal 20-1 receives information on resources related to scheduling (scheduling information of the operator 1) addressed to itself from the base station 10-1. In S44, terminal 20-1 receives information on resources for SL transmission in carrier 2 (for example, scheduling information for SL transmission for one or more terminals 20 in carrier 2) from base station 10-2.

In S45, the terminal 20-1 performs transmission control. Specifically, the terminal 20-1 may perform a predetermined operation when some or all of the resources for SL transmission allocated to itself from the base station 10-1 overlap with some or all of the resources received in S44 (for example, the SL transmission resources in other operators).

The above-described operations (transmission stop, transmission power increase, and normal transmission) may be performed according to at least one of priority (priority) of the allocated resources, the allocation order of the resources, and whether or not reservation of the resources is possible. As an example, the type of the priority of the allocated resource may be high or low, and if the priority=high, the transmission power may be increased, if the priority=medium, the normal transmission may be performed, and if the priority=low, the transmission may be stopped.

Another example will be described with reference to fig. 31. In S51, an RRC connection is established between the terminal 20-1 and the base station 10-1.

On the other hand, the terminal 20-1 receives the SSB from the base station 10-2 in S52, and performs PRACH transmission in S53. The PRACH resources (e.g., sequences) used for the PRACH transmission may be different from those used for the PRACH transmission for RRC connection.

After PRACH transmission, the terminal 20-1 receives setting information on reception of the PDCCH used by the operator 2 in SL transmission resource allocation from the base station 10-2 in S54. The setting information may include any one or more or all of a monitoring timing (monitoring occasion), CORESET, search space (search space), aggregation level (aggregation level), and RNTI value for reception of the PDCCH, for example.

In S55, the terminal 20-1 receives information on resources related to scheduling (scheduling information of the operator 1) addressed to itself from the base station 10-1. In S56, the terminal 20-1 receives information on resources for SL transmission in the carrier 2 (for example, scheduling information for SL transmission for one or more terminals 20 in the carrier 2) from the base station 10-2.

In S57, the terminal 20-1 performs transmission control. Here, as described above, for example, the terminal 20-1 may perform a predetermined operation when some or all of the resources for SL transmission allocated to itself from the base station 10-1 overlap with some or all of the resources (for example, SL transmission resources in other operators) received in S56. Examples of the predetermined actions are described above.

< scheduling method >

In embodiment 5, scheduling of resources (SL resources) for SL transmission from the base station 10 to the terminal 20 may be performed by a signal (e.g., UE-specific signal) transmitted to a single terminal 20, or by signals (e.g., group-common signal) transmitted to a plurality of terminals 20.

The signals to the plurality of terminals 20 may include information on SL resources allocated to each terminal 20. The signals to the plurality of terminals 20 may include information (for example, PUCCH slots, PUCCH resources, SAIs, DAIs, etc.) related to feedback to the base station 10. The signals to the plurality of terminals 20 may include both information on SL resources allocated to each terminal 20 and information on feedback to the base station 10.

As described above, when the signals addressed to the plurality of terminals 20 include the scheduling information (such as information on SL resources) allocated to each terminal 20, the terminal 20 may determine the scheduling information addressed to itself based on at least one of the following (1) to (3).

(1) The judgment is made by the RNTI scrambling the CRC of the DCI. For example, when the DCI is decoded by the specific RNTI, the terminal 20 determines that the DCI is addressed to itself.

(2) The terminal 20 determines the xth scheduling information out of N (N0) scheduling information included in the signals addressed to the plurality of terminals 20 as the scheduling information addressed to itself. Here, X may be designated from the base station 10 to the terminal 20 by a higher layer parameter such as an RRC signal or MAC CE.

(3) The judgment is made by the UE-IDs contained in the signals addressed to the plurality of terminals 20. For example, if the signal addressed to the plurality of terminals 20 includes the own UE-ID, the terminal 20 determines that the scheduling information of the signal is addressed to itself.

In the signals to the plurality of terminals 20, the predetermined parameter may be shared among the plurality of terminals 20. Here, the predetermined parameter is, for example, MCS, time-domain resource (time-domain resource), or the like.

< method of receiving scheduling information from multiple base stations >

An example in the case where the terminal 20 receives scheduling information from a plurality of base stations 10 will be described with reference to fig. 32 and 33. As in the previous example, base station 10-1 and terminal 20-1 belong to operator 1, and base station 10-2 and terminal 20-2 belong to operator 2.

In the example of fig. 32, the terminal 20-1 receives scheduling information addressed to itself from the base station 10-1 through DCI of the UE-specific. The terminal 20-1 receives scheduling information transmitted by SL in the operator 2, for example, by the method described in fig. 30 or fig. 31.

In the example of fig. 33, the terminal 20-1 receives the Group common scheduling information from the base station 10-1 through DCI of the Group common. The terminal 20-1 receives scheduling information transmitted by SL in the operator 2 by, for example, the method described in fig. 30 or fig. 31. Here, an example in which scheduling information for the terminal 20 under the control of the operator 2 is transmitted from the base station 10-2 of the operator 2 through DCI of the Group common (Group common) is shown.

In either one of the examples shown in fig. 32 and 33, for example, the terminal 20-1 can perform the above-described predetermined operation even when some or all of the resources for SL transmission allocated to itself from the base station 10-1 overlap with some or all of the SL transmission resources in the operator 2.

The terminal 20 may receive a plurality of DCIs related to different RNTIs from the base station 10 of each operator. At this time, the terminal 20 may determine that the scheduling information is the scheduling information to the other terminal 20 except the scheduling information to itself and cannot be used.

An example will be described in which the base station 10-1 and the terminal 20-1 belong to the carrier 1, and the base station 10-2 and the terminal 20-2 belong to the carrier 2.

For example, in the carrier 1, the base station 10-1 transmits a plurality of DCIs having a plurality of RNTI values set therein, which the plurality of terminals 20 under the control of the carrier 1 should receive. For example, the base station 10-1 transmits DCI with RNTI-a set to be received by the terminal 20-1 and DCI with RNTI-B set to be received by the terminal 21-1 as another terminal. Although an example using a plurality of RNTIs is shown here, a single RNTI may be set, and scheduling information addressed to itself may be identified by other than the RNTI.

Similarly, in the carrier 2, the base station 10-2 transmits a plurality of DCIs having a plurality of RNTI values set therein, which the plurality of terminals 20 under the control of the carrier 2 should receive. In this case, the terminal 20-1 of the operator 1 determines that all DCI received from the base station 10-2 corresponds to scheduling information addressed to the other terminal 20.

< envisaged example of reception >

It is also conceivable that the terminal 20 must receive signals addressed to a plurality of terminals 20 from each operator at PDCCH monitoring occasions (PDCCH monitoring occasion) of each operator. For example, in the example of fig. 33, it is also conceivable that the terminal 20-1 must receive DCI of the Group common as a signal to a plurality of terminals 20 from the base station 10-1 and the base station 10-2 at PDCCH monitoring timing of each operator.

The terminal 20 may determine not to perform SL transmission through the SL resource corresponding to the corresponding PDCCH monitoring timing if the signal addressed to the plurality of terminals 20 is not received from at least one of the plurality of operators for which reception is envisaged. Further, when SL resources corresponding to the timing are allocated, transmission of the SL resources may be stopped. This is because it is conceivable that the reception quality of the SL signal is degraded in this timing.

Further, it may mean that SL resource allocation is not performed to the terminal 20 in the case where a predetermined parameter set is notified from the base station 10 of any one of the operators to the terminal 20. The terminal 20 may receive SL schedules addressed to itself from the base stations 10 of a plurality of operators. In addition, the terminal 20-1 may report scheduling information received from the base station 10-1 to the base station 10-2.

< Effect of example 5 >

According to embodiment 5, the terminal 20 can perform a transmission collision avoidance operation based on the scheduling conditions of the respective operators.

(other examples)

For any one of embodiments 1 to 5, embodiments 1 to 5 may be implemented by replacing the base station 10 with a terminal 20 different from the terminal 20 under the control of the base station 10. That is, the technique of the embodiment may be applied to an operation in which one terminal 20 sets (or allocates) transmission resources of another terminal 20 for any one of embodiments 1 to 5.

The terminal 20 may be any terminal, V2X terminal, or a terminal other than the V2X terminal performing D2D in any of embodiments 1 to 5.

Note that, in any of embodiments 1 to 5, this operation may be performed only in a specific resource pool (resource pool). For example, in any of embodiments 1 to 5, the operation may be performed only in the resource pool usable by the terminal 20 after Rel-17.

(device Structure)

Next, a functional configuration example of the base station 10 and the terminal 20 that execute the above-described processing and operation will be described. The base station 10 and the terminal 20 include functions to implement the above-described embodiments 1 to 5. However, the base station 10 and the terminal 20 may each have only the functions of any one of embodiments 1 to 5.

< base station 10>

Fig. 34 is a diagram showing an example of the functional configuration of the base station 10. As shown in fig. 34, the base station 10 includes a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in fig. 34 is merely an example. The names of the functional sections and the functional differentiation may be arbitrary as long as the operations according to the embodiments of the present invention can be performed. The transmitting unit 110 and the receiving unit 120 may be referred to as communication units.

The transmitting unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher-layer information from the received signals. The transmitting unit 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signal, DL data, and the like to the terminal 20.

The setting unit 130 stores preset setting information and various setting information transmitted to the terminal 20 in a storage device, and reads the setting information from the storage device as necessary. The setting information is read from the setting unit 130 and transmitted to the terminal 20 by the transmitting unit 110.

The control unit 140 performs, for example, resource allocation, control of the entire base station 10, and the like. The transmitting unit 110 may include a function unit related to signal transmission in the control unit 140, and the receiving unit 120 may include a function unit related to signal reception in the control unit 140. The transmitter 110 and the receiver 120 may be referred to as a transmitter and a receiver, respectively.

< terminal 20>

Fig. 35 is a diagram showing an example of the functional configuration of the terminal 20. As shown in fig. 35, the terminal 20 includes a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in fig. 35 is merely an example. The names of the functional sections and the functional differentiation may be arbitrary as long as the operations according to the embodiments of the present invention can be performed. The transmitting unit 210 and the receiving unit 220 may be referred to as communication units.

The transmitting unit 210 generates a transmission signal from the transmission data, and transmits the transmission signal wirelessly. The receiving unit 220 receives various signals wirelessly and acquires a higher layer signal from the received physical layer signal.

The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device, and reads out the setting information from the storage device as necessary. The setting unit 230 also stores preset setting information. The control unit 240 performs control such as determination of availability of SL transmission using the allocated resources.

The transmitting unit 210 may include a function unit related to signal transmission in the control unit 240, and the receiving unit 220 may include a function unit related to signal reception in the control unit 240. The transmitter 210 and the receiver 220 may be referred to as a transmitter and a receiver, respectively.

According to the present embodiment, at least a terminal, a base station, and a transmission method described below are provided, for example. Hereinafter, description will be made for each of the related examples.

< examples 1 to 3>

(item 1)

A terminal, having:

a receiving unit that receives allocation information of resources transmitted from a side link from a base station of the 1 st carrier;

a control unit that determines whether or not to perform side link transmission using the resource, based on a side link signal received from a terminal of the 2 nd carrier; and

and a transmitting unit configured to perform the side link transmission using the resource when it is determined to perform the side link transmission using the resource.

(item 2)

The terminal according to claim 1, wherein,

a plurality of resources for side link transmission are allocated to the terminal,

the control unit selects a usable resource from the plurality of resources based on the side link signal.

(item 3)

The terminal according to claim 2, wherein,

the control unit determines a feedback resource to be transmitted to the base station based on a specific resource among the plurality of resources.

(item 4)

The terminal according to any one of items 1 to 3, wherein,

the transmitting unit transmits a NACK to the base station when the side link transmission using the resource allocated from the base station is not performed.

(item 5)

The terminal according to any one of items 1 to 4, wherein,

in the 1 st and 2 nd operators, a part of the side link receiving resource pool is a side link transmitting resource pool.

(item 6)

A transmission method, which is executed by a terminal, has the steps of:

receiving allocation information of resources sent by a side chain from a base station of a 1 st operator;

judging whether to perform side link transmission using the resource according to the side link signal received from the terminal of the 2 nd operator; and

when it is determined that the side link transmission using the resource is performed, the side link transmission using the resource is performed.

The technology according to any one of items 1 to 6 provides a technology capable of avoiding collision of side link transmissions between terminals of different operators. In particular, according to item 2, since a certain resource can be selected from a plurality of resources, flexible control is possible. According to item 3, the feedback resource (for example, timing) can be clarified. According to item 4, the base station can grasp the situation of the collision. According to item 5, for example, collision can be avoided by dividing a resource pool for side chain transmission among operators.

Example 4 ]

(item 1)

A terminal, having:

a receiving unit that receives, from a base station of the 1 st operator, allocation information of resources transmitted by a side link in at least one of the 1 st operator and the 2 nd operator;

a control unit that determines whether or not to transmit a side chain using the resource allocated from the base station, based on the resource allocation information; and

and a transmitting unit configured to execute the side link transmission when the side link transmission is determined to be performed.

(item 2)

The terminal according to claim 1, wherein,

the transmitting unit transmits the resource allocation information received from the base station via a side link.

(item 3)

A terminal, having:

a receiving unit that receives allocation information of resources transmitted from the side link in the 1 st carrier via the side link;

a control unit that determines whether or not to transmit a side link based on the resource allocation information; and

(item 4)

The terminal according to claim 3, wherein,

the transmitting unit transmits the resource allocation information to the base station of the 2 nd operator.

(item 5)

A base station, comprising:

a receiving unit that receives allocation information of resources transmitted by a side link in the 1 st carrier on an uplink;

a control unit that determines resources for side link transmission of the terminal of the 2 nd carrier based on the resource allocation information; and

and a transmitting unit configured to transmit the resource allocation information determined by the control unit to the terminal of the 2 nd operator.

(item 6)

A transmission method, which is executed by a terminal, has the steps of:

receiving allocation information of resources transmitted by a side link in at least one of the 1 st operator and the 2 nd operator from a base station of the 1 st operator;

judging whether to perform side link transmission using the resources allocated from the base station according to the allocation information of the resources; and

when it is determined that the side link transmission is performed, the side link transmission is performed.

The technology according to any one of items 1 to 6 provides a technology capable of avoiding collision of side link transmissions between terminals of different operators. In particular, according to item 2, the receiving side of the side link can learn allocation information of resources of other operators. According to item 4, the base station can learn allocation information of resources of other operators.

Example 5 ]

(item 1)

A terminal, having:

a receiving unit that receives, from a base station of a 1 st carrier, 1 st resource allocation information that is allocation information of resources transmitted by a side link in the 1 st carrier, and receives, from a base station of a 2 nd carrier, 2 nd resource allocation information that is allocation information of resources transmitted by a side link in the 2 nd carrier;

a control unit that determines whether or not to transmit a side link using a resource allocated by the 1 st resource allocation information, based on the 2 nd resource allocation information; and

(item 2)

The terminal according to claim 1, wherein,

the reception unit receives setting information for receiving the 2 nd resource allocation information from the 2 nd base station after PRACH transmission is performed by the transmission unit to the 2 nd base station.

(item 3)

The terminal according to claim 1 or 2, wherein,

the receiving unit receives signals transmitted from the 1 st base station to a plurality of terminals, and acquires the 1 st resource allocation information from the signals.

(item 4)

The terminal according to any one of items 1 to 3, wherein,

The reception unit is configured to receive signals addressed to a plurality of terminals from the base station of each operator at each PDCCH monitoring timing, and when a signal addressed to a plurality of terminals is not received at a certain PDCCH monitoring timing, the transmission unit does not perform side chain transmission via a resource corresponding to the certain PDCCH monitoring timing.

(item 5)

A base station, comprising:

a transmitting unit that transmits 1 st resource allocation information, which is allocation information of resources transmitted by side chains in the 1 st carrier, to the terminal; and

and a reception unit configured to, in the terminal that receives 2 nd resource allocation information, which is allocation information of resources transmitted by a side link in the 2 nd carrier, from a base station of the 2 nd carrier, receive NACK from the terminal when it is determined that the side link transmission using resources allocated by the 1 st resource allocation information is not performed based on the 2 nd resource allocation information.

(item 6)

A transmission method, which is executed by a terminal, has the steps of:

receiving, from a base station of a 1 st operator, 1 st resource allocation information, which is allocation information of resources transmitted by a side link in the 1 st operator, and receiving, from a base station of a 2 nd operator, 2 nd resource allocation information, which is allocation information of resources transmitted by a side link in the 2 nd operator;

Judging whether to transmit a side chain using the resource allocated by the 1 st resource allocation information according to the 2 nd resource allocation information; and

The technology according to any one of items 1 to 6 provides a technology capable of avoiding collision of side link transmissions between terminals of different operators. In particular, according to item 2, the setting information can be received from the base station of another operator without performing RRC connection. According to item 3, information addressed to the terminal can be acquired from signals transmitted to a plurality of terminals. According to item 4, for example, SL transmission can be performed under a situation where radio quality is good.

(hardware construction)

The block diagrams (fig. 34 and 35) used in the description of the above embodiment show blocks in units of functions. These functional blocks (structures) are realized by any combination of at least one of hardware and software. The implementation method of each functional block is not particularly limited. That is, each functional block may be realized by using one device physically or logically combined, or two or more devices physically or logically separated may be directly or indirectly connected (for example, by wire, wireless, or the like) and realized by using these plural devices. The functional blocks may also be implemented by combining software with the above-described device or devices.

Functionally, there are judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcast), notification (notification), communication (communication), forwarding (forwarding), configuration, reconfiguration (allocation), allocation (allocating, mapping), assignment (allocation), and the like, but not limited thereto. For example, a functional block (configuration unit) that causes transmission to function is called a transmitter (transmitting unit) or a transmitter (transmitter). In short, the implementation method is not particularly limited as described above.

For example, the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 36 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to one embodiment of the present disclosure. The base station 10 and the terminal 20 may be physically configured as computer devices including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the following description, the term "means" may be replaced with "circuit", "device", "unit", or the like. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the illustrated devices, or may be configured to include no part of the devices.

The functions in the base station 10 and the terminal 20 are realized by the following methods: the processor 1001 performs an operation by reading predetermined software (program) into hardware such as the processor 1001 and the storage device 1002, and controls at least one of communication by the communication device 1004 and reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may be configured by a central processing unit (CPU: central Processing Unit) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the control unit 140, the control unit 240, and the like may be realized by the processor 1001.

Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes accordingly. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station 10 shown in fig. 34 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. For example, the control unit 240 of the terminal 20 shown in fig. 35 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above-described various processes are described as being executed by one processor 1001, the above-described various processes may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may also be mounted by more than one chip. In addition, the program may also be transmitted from the network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium, and may be configured by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM: erasable programmable Read Only Memory), EEPROM (Electrically Erasable Programmable ROM: electrically erasable programmable Read Only Memory), RAM (Random Access Memory: random access Memory), and the like. The storage 1002 may also be referred to as a register, a cache, a main memory (main storage), or the like. The storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement a communication method according to an embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, and may be configured of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a Floppy disk, a magneto-optical disk (for example, a Compact Disc, a digital versatile Disc, a Blu-ray (registered trademark) Disc), a smart card, a flash memory (for example, a card, a stick, a Key drive), a pivotable (registered trademark) Disc, a magnetic stripe, and the like. The secondary storage 1003 may also be referred to as secondary storage. The storage medium may be, for example, a database including at least one of the storage device 1002 and the auxiliary storage device 1003, a server, or other suitable medium.

The communication device 1004 is hardware (transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like, for example. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, to realize at least one of frequency division duplexing (FDD: frequency Division Duplex) and time division duplexing (TDD: time Division Duplex). For example, a transmitting/receiving antenna, an amplifying unit, a transmitting/receiving unit, a transmission path interface, and the like may be realized by the communication device 1004. The transmitting/receiving unit may be physically or logically separate from the transmitting unit.

The input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a key, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, an LED lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrally formed (for example, a touch panel).

The processor 1001 and the storage device 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using a bus different between devices.

The base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP: digital Signal Processor), an ASIC (Application Specific Integrated Circuit: application specific integrated circuit), a PLD (Programmable Logic Device: programmable logic device), an FPGA (Field Programmable Gate Array: field programmable gate array), or may be configured to implement a part or all of the functional blocks by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

(supplement of the embodiment)

While the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will appreciate various modifications, substitutions, alternatives, and the like. Specific numerical examples are described for the purpose of promoting the understanding of the present invention, but these numerical examples are only examples and any appropriate values may be used unless otherwise specified. The distinction between items in the above description is not essential to the present invention, and items described in two or more items may be used in combination as required, or items described in one item may be applied to items described in another item (unless contradiction arises). The boundaries of functional units or processing units in the functional block diagrams do not necessarily correspond to the boundaries of physical components. The operation of the plurality of functional units may be physically performed by one member, or the operation of the plurality of functional units may be physically performed by a plurality of members. With regard to the processing procedures described in the embodiments, the order of processing may be exchanged without contradiction. For ease of illustration, the base station 10 and the terminal 20 are illustrated using functional block diagrams, but such means may also be implemented in hardware, in software, or in a combination thereof. The software operating by the processor provided by the base station 10 according to the embodiment of the present invention and the software operating by the processor provided by the terminal 20 according to the embodiment of the present invention may be stored in Random Access Memory (RAM), flash memory, read Only Memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), a removable disk, a CD-ROM, a database, a server, and any other suitable storage medium, respectively.

Further, the notification of the information is not limited to the form/embodiment described in the present disclosure, and may be performed using other methods. For example, the notification of the information may be implemented by physical layer signaling (e.g., DCI (Downlink Control Information: downlink control information), UCI (Uplink Control Information: uplink control information)), higher layer signaling (e.g., RRC (Radio Resource Control: radio resource control) signaling, MAC (Medium Access Control: medium access control) signaling, broadcast information (MIB (Master Information Block: master information block), SIB (System Information Block: system information block)), other signals, or a combination thereof.

The various forms/embodiments described in the present disclosure may also be applied to at least one of LTE (Long Term Evolution: long term evolution), LTE-a (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4 th generation mobile communication system: fourth generation mobile communication system), 5G (5 th generation mobile communication system: fifth generation mobile communication system), FRA (Future Radio Access: future wireless access), NR (New Radio: new air interface), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, UMB (Ultra Mobile Broadband: ultra mobile broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-wide), bluetooth (registered trademark), systems using other suitable systems, and next generation systems extended accordingly. Further, a plurality of systems (for example, a combination of 5G and at least one of LTE and LTE-a) may be applied in combination.

The processing procedures, timings, flows, and the like of the respective modes/embodiments described in the present specification can be replaced without contradiction. For example, for the methods described in this disclosure, elements of the various steps are presented using an illustrated order, but are not limited to the particular order presented.

In the present specification, the specific operation performed by the base station 10 may be performed by an upper node (upper node) according to circumstances. In a network consisting of one or more network nodes (network nodes) having a base station 10, it is apparent that various actions performed for communication with a terminal 20 may be performed by at least one of the base station 10 and other network nodes (for example, MME or S-GW, etc. may be considered, but not limited thereto) other than the base station 10. In the above, the case where one other network node other than the base station 10 is illustrated, but the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information, signals, and the like described in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). Or may be input or output via a plurality of network nodes.

The input or output information and the like may be stored in a specific location (for example, a memory), or may be managed using a management table. The input or output information and the like can be rewritten, updated or recorded. The outputted information and the like may also be deleted. The input information and the like may also be transmitted to other devices.

The determination in the present disclosure may be performed by a value (0 or 1) represented by 1 bit, may be performed by a Boolean value (true or false), or may be performed by a comparison of numerical values (e.g., a comparison with a predetermined value).

With respect to software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted as a command, a set of commands, code, a code segment, program code, a program (program), a subroutine, a software module, an application, a software package, a routine, an object, an executable, a thread of execution, a procedure, a function, or the like.

In addition, software, commands, information, etc. may be transmitted and received via a transmission medium. For example, in the case where software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL: digital Subscriber Line), etc.), and wireless technology (infrared, microwave, etc.), at least one of the wired and wireless technologies is included in the definition of transmission medium.

Information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions (commands), information, signals, bits, symbols, chips (chips), and the like may be referenced throughout the above description by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

In addition, the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). In addition, the signal may also be a message. In addition, the component carrier (CC: component Carrier) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

The terms "system" and "network" as used in this disclosure are used interchangeably.

In addition, information, parameters, and the like described in this disclosure may be expressed using absolute values, relative values to predetermined values, or other information corresponding thereto. For example, radio resources may also be indicated by an index.

The names used for the above parameters are not limiting names in any way. Further, the numerical formulas and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. The various names assigned to the various channels and information elements are not limiting names in any respect, as they may be identified by all appropriate names (e.g., PUSCH, PUCCH, PDCCH, etc.).

In the present disclosure, terms such as "Base Station", "radio Base Station", "fixed Station", "NodeB", "eNodeB (eNB)", "gndeb (gNB)", "access point", "transmission point (transmission point)", "reception point", "transmission point", "reception point", "cell", "sector", "cell group", "carrier", "component carrier", and the like may be used interchangeably. The terms macrocell, microcell, femtocell, picocell, and the like are also sometimes used to refer to a base station.

The base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services through a base station subsystem (for example, an indoor small base station (RRH: remote Radio Head (remote radio head)), and the term "cell" or "sector" refers to a part or the entire coverage area of at least one of a base station and a base station subsystem that performs communication services within the coverage area.

In the present disclosure, terms such as "Mobile Station", "terminal", "UE (User Equipment)", and "terminal" may be used interchangeably.

For mobile stations, those skilled in the art are sometimes referred to by the following terms: a subscriber station, mobile unit (mobile unit), subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, or some other suitable terminology.

At least one of the base station and the mobile station may be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The mobile body may be a vehicle (e.g., an automobile, an airplane, etc.), a mobile body that moves unmanned (e.g., an unmanned aerial vehicle, an autopilot, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station also includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things: internet of things) device such as a sensor.

In addition, the base station in the present disclosure may be replaced with a terminal. For example, the various forms/embodiments of the present disclosure may also be applied to a structure in which communication between a base station and a terminal is replaced with communication between a plurality of terminals 20 (for example, may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything system), or the like). In this case, the terminal 20 may have the functions of the base station 10. Further, the terms "upstream" and "downstream" may be replaced with terms (e.g., "side") corresponding to the inter-terminal communication. For example, the uplink channel, the downlink channel, and the like may be replaced with side channels.

Likewise, the terminals in the present disclosure may be replaced with base stations. In this case, the base station may have the functions of the terminal.

The terms "determining" and "determining" used in the present disclosure may include various operations. The "judgment" and "determination" may include, for example, a matter in which judgment (determination), calculation (calculation), processing (processing), derivation (development), investigation (investigation), search (lookup up, search, inquiry) (for example, search in a table, database, or other data structure), confirmation (evaluation), or the like are regarded as a matter in which "judgment" and "determination" are performed. Further, "determining" and "deciding" may include a matter in which reception (e.g., reception of information), transmission (e.g., transmission of information), input (input), output (output), access (e.g., access of data in a memory) is performed as a matter in which "determining" and "deciding" are performed. Further, "judging" and "determining" may include the matters of performing a decision (resolving), a selection (selecting), a selection (setting), a establishment (establishing), a comparison (comparing), and the like as matters of performing "judging" and "determining". That is, "determining" or "determining" may include what is considered to be "determining" or "determining" certain actions. The "judgment (decision)" may be replaced by "assumption", "expectation", "consider", or the like.

The terms "connected," "coupled," or any variation of these terms are intended to refer to any direct or indirect connection or coupling between two or more elements, including the case where one or more intervening elements may be present between two elements that are "connected" or "coupled" to each other. The combination or connection of the elements may be physical, logical, or a combination of these. For example, "connection" may also be replaced with "access". As used in this disclosure, two elements may be considered to be "connected" or "joined" to each other using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy or the like having wavelengths in the wireless frequency domain, the microwave region, and the optical (both visible and invisible) region.

The reference signal may be simply RS (Reference Signal) or may be called Pilot (Pilot) depending on the standard applied.

As used in this disclosure, the recitation of "according to" is not intended to mean "according to" unless explicitly recited otherwise. In other words, the term "according to" means "according to" and "according to" at least.

Any reference to elements referred to using "1 st", "2 nd", etc. as used in this disclosure also does not entirely define the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to elements 1 and 2 do not indicate that only two elements can be taken or that in some forms element 1 must precede element 2.

The "unit" in the structure of each device may be replaced with "part", "circuit", "device", or the like.

Where the terms "include", "comprising" and variations thereof are used in this disclosure, these terms are intended to be inclusive as well as the term "comprising". Also, the term "or" as used in this disclosure means not exclusive or.

A radio frame may be made up of one or more frames in the time domain. In the time domain, one or more of the frames may be referred to as subframes. A subframe may further be composed of one or more slots in the time domain. The subframes may also be a fixed length of time (e.g., 1 ms) independent of the parameter set (numerology).

The parameter set may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may represent, for example, at least one of a subcarrier spacing (SCS: subCarrier Spacing), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI: transmission Time Interval), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like.

A slot may be formed in the time domain from one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing: orthogonal frequency division multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access: single carrier frequency division multiple access) symbols, etc.). A slot may be a unit of time based on a set of parameters.

A slot may contain multiple mini-slots. Each mini-slot may be made up of one or more symbols in the time domain. In addition, the mini-slot may also be referred to as a sub-slot. Mini-slots may be made up of a fewer number of symbols than slots. PDSCH (or PUSCH) transmitted in units of time greater than the mini-slot may be referred to as PDSCH (or PUSCH) mapping type (type) a. PDSCH (or PUSCH) transmitted using mini-slots may be referred to as PDSCH (or PUSCH) mapping type (type) B.

The radio frame, subframe, slot, mini-slot, and symbol each represent a unit of time when a signal is transmitted. Radio frames, subframes, slots, mini-slots, and symbols may use other designations corresponding to each.

For example, one subframe may also be referred to as a transmission time interval (TTI: transmission Time Interval), a plurality of consecutive subframes may also be referred to as TTIs, and one slot or one mini slot may also be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the conventional LTE, may be a period (e.g., 1-13 symbols) shorter than 1ms, or may be a period longer than 1 ms. In addition, a unit indicating a TTI may not be referred to as a subframe, but may be referred to as a slot, a mini-slot, or the like.

Here, the TTI is, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, the base station performs scheduling for each terminal 20 to allocate radio resources (bandwidth, transmission power, and the like that can be used in each terminal 20) in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a data packet (transport block), a code block, a codeword, or the like after channel coding, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, the time interval (e.g., number of symbols) in which a transport block, a code block, a codeword, etc. is actually mapped may be shorter than the TTI.

In addition, in the case where 1 slot or 1 mini slot is referred to as a TTI, more than one TTI (i.e., more than one slot or more than one mini slot) may constitute a minimum time unit of scheduling. In addition, the number of slots (the number of mini slots) constituting the minimum time unit of scheduling can be controlled.

A TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in LTE rel.8-12), normal TTI (normal TTI), long TTI (long TTI), normal subframe (normal subframe), long (long) subframe, slot, etc. A TTI that is shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI (short TTI), a partial or fractional TTI, a shortened subframe, a short (short) subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, for long TTIs (long TTIs) (e.g., normal TTIs, subframes, etc.), a TTI having a time length exceeding 1ms may be substituted, and for short TTI (short TTI) (e.g., shortened TTI, etc.), a TTI having a TTI length less than the long TTI (long TTI) and having a TTI length of 1ms or more may be substituted.

A Resource Block (RB) is a resource allocation unit of a time domain and a frequency domain, in which one or more consecutive subcarriers (subcarriers) may be included. The number of subcarriers contained in the RB may be the same regardless of the parameter set, for example, 12. The number of subcarriers included in the RB may also be determined according to the parameter set.

Further, the time domain of the RB may contain one or more symbols, and may be 1 slot, 1 mini slot, 1 subframe, or 1TTI in length. A 1TTI, a 1 subframe, etc. may each be composed of one or more resource blocks.

In addition, one or more RBs may be referred to as Physical resource blocks (PRB: physical RBs), subcarrier groups (SCG: sub-Carrier groups), resource element groups (REG: resource Element Group), PRB pairs, RB peering.

Furthermore, a Resource block may be composed of one or more Resource Elements (REs). For example, 1RE may be a radio resource region of 1 subcarrier and 1 symbol.

A Bandwidth Part (BWP: bandwidth Part), which may be referred to as a Bandwidth Part or the like, may represent a subset of consecutive common RBs (common resource blocks: common resource blocks) for a certain parameter set in a certain carrier. Here, the common RB may be determined by an index of the RB with reference to a common reference point of the carrier. PRBs may be defined in a certain BWP and numbered within the BWP.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). One or more BWP may be set for the UE within the 1 carrier.

At least one of the set BWP may be active, and a case where the UE transmits and receives a predetermined signal/channel outside the active BWP may not be envisaged. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

The structure of the radio frame, subframe, slot, mini slot, symbol, etc. described above is merely an example. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols within a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like may be variously changed.

In the present disclosure, for example, where an article is added by translation as in a, an, and the in english, the present disclosure may also include a case where a noun following the article is in plural.

In the present disclosure, the term "a is different from B" may also mean that "a is different from B". The term "a" and "B" may be different from "C". The terms "separate," coupled, "and the like may also be construed as" different.

Each of the modes and embodiments described in this disclosure may be used alone, in combination, or switched depending on execution. Note that the notification of the predetermined information is not limited to being explicitly performed (for example, notification of "yes" or "X"), and may be performed implicitly (for example, notification of the predetermined information is not performed).

In addition, in the present disclosure, an SS block or CSI-RS is an example of a synchronization signal or a reference signal.

The present disclosure has been described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the description of the present disclosure is intended to be illustrative, and not in any limiting sense.

Description of the reference numerals

10: a base station;

110: a transmitting unit;

120: a receiving section;

130: a setting unit;

140: a control unit;

20: a terminal;

210: a transmitting unit;

220: a receiving section;

230: a setting unit;

240: a control unit;

1001: a processor;

1002: a storage device;

1003: an auxiliary storage device;

1004: a communication device;

1005: an input device;

1006: and an output device.

Claims

1. A terminal, having:

2. The terminal of claim 1, wherein,

3. A terminal, having:

4. The terminal of claim 3, wherein,

5. A base station, comprising:

6. A transmission method, which is executed by a terminal, has the steps of: